Method of fabricating a metal oxide

Abstract

A method of fabricating a metal oxide sheet having a polycrystalline structure includes mixing a metal precursor material, a base material, and distilled water with each other to fabricate a preparation solution; adding an anionic surfactant into the preparation solution to forming a precursor solution; forming metal oxide nanoparticles in the precursor solution, wherein each of the metal oxide nanoparticles comprises a metal cation and an oxygen anion; and fabricating a metal oxide sheet by coupling the metal oxide nanoparticles to each other, wherein, in an aspect of a plane, the metal oxide sheet has a hexagonal shape and a polycrystalline structure.

What is claimed is: 
     
       1. A method of fabricating a metal oxide sheet having a polycrystalline structure, the method comprising:
 mixing a metal precursor material, a base material, and distilled water with each other to fabricate a preparation solution; 
 adding an anionic surfactant into the preparation solution to forming a precursor solution; 
 forming metal oxide nanoparticles in the precursor solution, wherein each of the metal oxide nanoparticles comprises a metal cation and an oxygen anion; and 
 fabricating a metal oxide sheet by coupling the metal oxide nanoparticles to each other, 
 wherein, in an aspect of a plane, the metal oxide sheet has a hexagonal shape and a polycrystalline structure. 
 
     
     
       2. The method of  claim 1 , wherein each of the metal oxide nanoparticles has a first end and a second end, which face each other, and the anionic surfactant covers the first end and the second end of the metal oxide nanoparticle, and a side portion of the metal oxide nanoparticle is spaced apart from the anionic surfactant. 
     
     
       3. The method of  claim 2 , wherein a coupling reaction rate at the side portion of the metal oxide nanoparticle is faster than that at each of the first end and the second end of the metal oxide nanoparticle. 
     
     
       4. The method of  claim 1 , wherein the fabricating of the metal oxide sheet comprises horizontally coupling the metal oxide nanoparticles to each other, wherein the anionic surfactant is provided to upper and lower ends of the metal oxide nanoparticle. 
     
     
       5. The method of  claim 1 , wherein the anionic surfactant is dissociated into a cation and an active agent in the precursor solution, and the active agent comprises a hydrophobic functional group and a hydrophilic functional group coupled to the hydrophobic functional group, and the metal oxide nanoparticle is disposed between the hydrophilic functional group and the cation of the anionic surfactant. 
     
     
       6. The method of  claim 5 , wherein the hydrophilic functional group of the anionic surfactant is provided on the metal cation of the metal oxide nanoparticle, and a cation of the anionic surfactant is provided on the oxygen anion of the metal oxide nanoparticle. 
     
     
       7. The method of  claim 1 , wherein the forming of the metal oxide nanoparticles and the fabricating of the metal oxide sheet are performed by thermally treating the precursor solution.